free weights. Free weights (including barbells, dumbbells, and
hand weights) are portable and inexpensive. It may take some practice to learn good
technique.

weight machines. Weight machines make it easier to follow good
technique, but you will probably have to go to a gym or weight room.

People can also use resistance bands and even their own body weight (as in push-ups,
sit-ups, planks, and squats) for strength training.

If you haven't started puberty, strength training
will help you get stronger but your muscles won't get bigger. After puberty, the male
hormone,
testosterone
, helps build muscle in response to weight training. Because guys have
more testosterone than girls do, they get bigger muscles.

What Are the Benefits of Strength Training?

Besides building stronger muscles, strength training can:

improve overall fitness

increase lean body mass (more muscle, less fat)

burn more calories

make bones stronger

improve mental health

How Do I Get Started?

Before you start strength training, visit your doctor to make sure it's safe for
you to lift weights.

When you get the OK from your doctor, get some guidance and expert advice. Trainers
who work at schools, gyms, and in weight rooms know about strength training. But look
for someone who is a certified strength-training expert and experienced working with
teens.

The best way to learn proper technique is to do the exercises without any weight.
After you've mastered the technique, you can gradually add weight as long as you can
comfortably do the exercise for 8 to 15 repetitions.

When lifting weights — either free weights or on a machine — make sure that there's
always someone nearby to supervise.

Having a spotter nearby is particularly important when using free weights. Even
someone in great shape sometimes just can't make that last rep. It's no big deal if
you're doing biceps curls; all you'll have to do is drop the weight onto the floor.
But if you're in the middle of a bench press — a chest exercise where you're lying
on a bench and pushing a loaded barbell away from your chest — it's easy to get hurt
if you drop the weight. A spotter can keep you from dropping the barbell onto your
chest.

Many schools offer weight or circuit training in their gym classes. Or check out
your local gym to see if you can sign up for a strength training class.

Is Strength Training Safe?

Strength-training programs are generally safe. When done properly, strength training
won’t damage growing bones. Kids and teens with some medical conditions — such
as uncontrolled high blood pressure, seizures, or heart problems — will need
to be cleared by their doctors before starting a strength-training program.

When you're in the middle of a strength-training session and something doesn't
feel right to you, you feel pain, or if you hear or feel a "pop" during
a workout, stop what you're doing. Have a doctor check it out before you go back to
training. You may need to change your training or even stop lifting weights for a
while to allow the injury to heal.

Many people tend to lump all types of weightlifting together. But there's a big
difference between strength training, powerlifting, and bodybuilding. Powerlifting
concentrates on how much weight a person can lift at one time. The goal of competitive
bodybuilding is to build muscle size and definition.

Powerlifting, maximal lifts, and bodybuilding are not recommended for teens who
are still maturing. That's because these types of activity increase the chance of
injuries.

Some people looking for big muscles may turn to anabolic
steroids or other performance-enhancing drugs. These substances are risky and
can cause problems like acne, balding, and high
blood pressure. They also increase the chances of getting cancer, heart disease,
and sterility.

What's a Healthy Routine?

Here are some basic rules to follow in strength training:

Warm up for 5–10 minutes before each session.

If you are new to strength training, start with body weight exercises for a few
weeks (such as sit-ups, push-ups, and squats) and work on technique without using
weights.

Work out with resistance (weights, resistance bands, or body weight) about three
times a week. Avoid weight training on back-to-back days.

Do 2–3 sets of higher repetitions (8–15); No maximum lifts. A certified trainer,
coach, or teacher can help put together a program that is right for you.

Learn correct technique and always train with supervision

Cool down for 5–10 minutes after each session, stretching the muscles you worked
out.

For best results, do strength exercises for at least 20–30 minutes 2 or 3 days
per week. Take at least a day off between sessions. Work the major muscle groups of
your arms, legs, and core (abdominal muscles, back, and buttocks).

Doctors recommend at least an hour a day of moderate to vigorous physical activity.
So on days when you're not lifting weights, aim for more aerobic activity. Also, drink
plenty of liquids and eat a healthy diet for better performance and recovery.